Vulnerability in Opc Foundation Ua .Net Standard
CVE-2020-8867
This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard 1.04.358.30. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of sessions. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to create a denial-of-service condition against the application. Was ZDI-CAN-10295.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.026 (85.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: +0.001
Affected products
- Opc Foundation Ua .Net Standard — versions 1.04.358.30
- Opcfoundation Unified Architecture .Net-Standard
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-20-536/ (VDB Entry, Third Party Advisory)
- opcfoundation.org/SecurityBulletins/OPC Foundation Security Bulletin CVE-2020-8… (Vendor Advisory)
Frequently asked questions
- What is CVE-2020-8867?
- CVE-2020-8867 is a high-severity vulnerability in Opc Foundation Ua .Net Standard, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.5/10. Published 2020-04-22.
- How severe is CVE-2020-8867?
- High severity. CVSS v3 base score is 7.5 out of 10.